1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c5fbc2d0fa1fba1955632b768c9aefeddcf97303bc36ce6f0f33aac76142c3. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c536de89-1c67-4ca0-b42c-d191654d30b3.json and https://artists.proofprofile.net/proofs/artist/c536de89-1c67-4ca0-b42c-d191654d30b3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c059eccd1bb831f0cc55718b5e313b26fe52fe49586285e9752ce4b3cc46ea8. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506de209f24c4d3bfe4e04d36792815b0fa50c6f287c19538f2197457518a342. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5b08fa82de57ab3ebc4c75021fe30778850e4bc63008b306c18777b5ec8a70. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2745e7c5f0c178a9c64bd927f8550e7e43cf4ffb66dfd1220f903b124d17116a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c6a1b52d88f9104ca71ba420194f4d8458eea9100b51218f9be32bfd6b67cb6. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8194c8bb53815650b2ca91e3fee48d519f5f28b2f5db5a5cbf9c7e539f8c7e2. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a8d8b665aede2ed037a09d8bb8e17396563585c47109bd4c65de89a40f2828. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30b3f6c8c6a1ae4cc3feb452c92020f2c55f81ed1083751584bb7c7285a2400. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2111105ec50db5737182d66828aa96d49b36c77581923a6c601b302f7b03578. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ddde0eb9a976881de4bcca97ce2b35e23009a325323d2db27c7af09fc58e351. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129c51cbfb9d774ca5cfd3d0e6dcce563fb49797eb63bb0bb61586c4d922e7d9. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac401f18b0db392b326849fd90121d8e91583cba6bb27a97f1e22ced119bd7a. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9044984907e92001d65827a81f5548339453bbe9378461b647ea6c0d4a22f0d. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b56a6f5bdb5a672a91868da088d6a05ce1f00d760a0c1ab20d59fa551070246. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x793b1748a7d6365cd09f6c1bc2df0814ee4419e76b8a67d89e03a17f27f1ea38. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcaec0699b73a919f4add3944c273300cf84f72853523231aca380d05b1460e7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1010528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee51a5e1b122d6201b1ecb14742019dc6e845c988caaf87f512701cdf7a4415. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1011259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25477bfcfa13773095e112c9dd24fac26b885ca0af753ad2b0c9930745f30d1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USERN1011266.